Joystick and LCD

Question 1

What is the resolution of the LCD?

Answer 1

84x48

Question 2

How is the LCD controlled?

Answer 2

Using an SPI interface

Question 3

What are the 4 wires for SPI?

Answer 3

> SCLK
MOSI
MISO
SS (CSE)

Question 4

How does the microcontroller control the screen?

Answer 4

It has a screen buffer. This is a 84x48 char array which maps directly to each pixel.
When refresh is sent it transfers the entire buffer over to the screen

Question 5

What is required to set up the screen?

Answer 5

N5110 lcd;

lcd. init();
lcd. setContrast(0.4);

Question 6

What is the print string command for the LCD?

Answer 6

lcd.printString(“string”,0,0);

Question 7

How do you change a pixel to black or white?

Answer 7

lcd. setPixel(2,5,false);

lcd. setPixel(2,5,true);

Question 8

What is the command to check the status of a pixel?

Answer 8

lcd.getPixel(2,2);

Question 9

What is the required setup for the joystick?

Answer 9

Joystick joystick(PTB11,PTB10);
joystick.init();

Question 10

What is the issue with getting just the x and y coordinates? How is this solved?

Answer 10

> When the joystick is in a corner, it will be faster because the magnitude of the vector is larger.
To solve this, we plot all points on a points inside a unit circle.